Airlines Told to Disregard Gender- Neutral ‘X’ on U.S. Passports and Add ‘M’ or ‘F’

Although passports with an “X” marker remain valid, a new federal rule requires airlines on their internal information system to mark passengers with an “M” or an “F.”Although passports with an “X” marker remain valid, a new federal rule requires airlines on their internal information system to mark passengers with an “M” or an “F.”